| Alpena to Octeville | 3,647.79 mi (5,870.55 km) |
| Alpena to Oignies | 3,797.88 mi (6,112.10 km) |
| Alpena to Oissel | 3,764.34 mi (6,058.12 km) |
| Alpena to Olivet | 3,848.53 mi (6,193.61 km) |
| Alpena to Ollioules | 4,188.72 mi (6,741.09 km) |
| Alpena to Olonne-sur-Mer | 3,748.13 mi (6,032.04 km) |
| Alpena to Oloron-Sainte-Marie | 3,918.42 mi (6,306.08 km) |
| Alpena to Onet Village | 4,007.08 mi (6,448.77 km) |
| Alpena to Onnaing | 3,823.62 mi (6,153.52 km) |
| Alpena to Orange | 4,106.46 mi (6,608.71 km) |
| Alpena to Orchies | 3,807.17 mi (6,127.04 km) |
| Alpena to Orleans | 3,847.47 mi (6,191.90 km) |
| Alpena to Orly | 3,836.12 mi (6,173.64 km) |
| Alpena to Ormesson-sur-Marne | 3,840.28 mi (6,180.33 km) |
| Alpena to Orsay | 3,829.76 mi (6,163.41 km) |
